JP4720422B2 - Sound insulation structure of automobile - Google Patents

Description

  The present invention relates to a sound insulation structure for an automobile.

  As a sound insulation structure of an automobile for improving quietness in a vehicle interior, Patent Document 1 discloses a cowl box provided in the vehicle width direction along the front edge of a front window, and a dash panel extending downward from the cowl box. In a vehicle equipped with a dash panel and a cowl box, a sound absorbing material attached to substantially the entire surface on the engine room side has been proposed.

Japanese Utility Model Publication No. 5-32157

  In the sound insulation structure described in Patent Document 1, noise in the engine room that is about to enter the vehicle compartment through the dash panel and the cowl box is absorbed by the sound absorbing material, and the quietness in the vehicle compartment can be improved. However, the noise source in the engine room is not only the engine but also the noise from the road surface transmitted to the tire house via the front suspension. In the sound insulation structure described in Patent Document 1, the noise from the tire house is sufficiently reduced. Could not be absorbed.

  An object of the present invention is to provide a sound insulation structure for an automobile that can further reduce noise transmitted from an engine room to a vehicle interior.

A sound insulation structure for an automobile according to the present invention includes a cowl grill upper portion extending from an upper front edge portion of a front wind to a lower portion of a rear edge portion of a bonnet, and a cowl grill front portion extending downward from a front edge portion of the cowl grill upper portion. The cowl grille having a cowl grille having a cowl grille extending to the tire house and removably fixed to the tire house is provided, and extends in the vehicle width direction along the front part of the cowl grille. A sound absorbing material for a cowl grill is provided, a sound absorbing material for a tire house is provided along the extension portion of the cowl grill, the cowl grill is divided into a cowl grill upper part and a cowl grill front part, overlapped portion is formed extending rearward and connected to a front end portion of the cowl grille upper superimposed on the lower side of the overlapping portion with the, mosquito Uruguay A cowl grille extending portion is integrally provided at the front of the rill.

Here, the sound absorbing material for the tire house is provided between the cowl grille extension portion and the tire house, the sound absorbing material for the tire house is integrally provided at both ends of the sound absorbing material for the cowl grill , and the cowl grill front portion And forming a weak portion for promoting bending deformation of the front portion of the cowl grill with respect to a load from above at a set interval in the vehicle width direction or over the entire width in the vehicle width direction. Connecting the front part of the grille with an engagement structure that is weak against the load from above, the upper part of the cowl grill is made of a softer material than the front part of the cowl grille, and the front part of the cowl grille is more than the upper part of the cowl grille. It is a preferred embodiment that it is made of a brittle material .

  According to the sound insulation structure for an automobile according to the present invention, noise from the engine can be absorbed by the sound absorbing material for the cowl grill, so that transmission of noise to the vehicle interior via the cowl grill can be suppressed. In addition, noise from the tire house is absorbed by the noise absorption material for the tire house, while noise from the tire house is absorbed by the sound absorbing material for the tire house, because the cowl grille extending part extending over the tire house is blocked. Is effectively suppressed, and the quietness of the passenger compartment can be further improved.

The cowl grill is divided into a cowl grill upper part and a cowl grill front part, and a cowl grill extending part is integrally provided on the cowl grill upper part or the cowl grill front part. Since it is not necessary to remove the suspension, it is possible to improve workability when the suspension is repaired or replaced.

  When the sound absorbing material for tire house is provided between the cowl grille extending portion and the tire house, noise transmitted from the cowl grill into the cowl can be effectively absorbed.

  When the sound absorbing material for the tire house is integrally provided at both ends of the sound absorbing material for the cowl grill, the assembling property of the sound absorbing material can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 5, the front vehicle body structure of an automobile will be described. A pair of left and right front side frames 1 extending in the front-rear direction are provided at the lower part of the vehicle body, and above the left and right front side frames 1. An apron reinforcement 2 extending in the front-rear direction is provided, and a pair of left and right apron panels 4 constituting the side wall of the engine room 3 are provided across the apron reinforcement 2 and the front side frame 1. A bonnet 5 for closing the upper opening of the engine room 3 is provided, and the bonnet 5 is supported in the vicinity of the rear end of the apron reinforcement 2 by a pair of left and right hinge members (not shown) that can be opened and closed. .

  A tire house 6 that bulges toward the engine room 3 is formed at the rear part of the apron panel 4, and a suspension tower 7 is provided at the upper part of the tire house 6, and a front suspension 8 is provided inside the tire house 6 and the suspension tower 7. Has been. The front suspension 8 is fixed to the upper wall portion 7a by inserting the bolt member 8a provided at the upper end portion thereof into the upper wall portion 7a of the suspension tower 7 and fastening the nut member 9 from the upper side. When the vehicle is replaced, the nut member 9 is loosened and replaced while the automobile is jacked up.

A dash panel 17 dividing the engine room 3 and the vehicle compartment 16 is provided at the rear part of the engine room 3 in the vehicle width direction, and a front pillar 10 extending obliquely upward rearward is provided at the rear end part of the apron reinforcement 2. It provided al is, cross-sectionally closed shape of the cowl 13 between a lower end portion comprising a top and cowl upper panel 11 and the cowl lower panel 12. dash panel 17 of the left and right front Pila 10 is provided in the vehicle width direction, of the front window 19 The front end edge is fixedly placed on the front end portion of the cowl 13, and the left and right side edges of the front window 19 are fixedly placed on the front pillar 10.

  A cowl front panel 14 extending forward is provided at the front end of the cowl lower panel 12, and a cowl grill 15 is provided above the cowl front panel 14.

  The cowl grill 15 includes a cowl grill upper part 20 that extends from the upper side of the front edge of the front window 19 to the lower side of the rear edge of the bonnet 5, and a cowl grill front part 21 that extends downward from the front edge of the cowl grill upper part 20. And provided over substantially the entire width in the vehicle width direction. An inverted V-shaped protruding portion 22 is formed in the vicinity of the front end of the cowl grill upper portion 20, and a grill portion 23 formed with a plurality of through holes is formed in the cowl grill upper portion 20 in front of the protruding portion 22. Has been. A bank portion 24 raised one step is formed at the front end portion of the cowl grill upper portion 20, and a reinforcing portion 25 extending downward is formed at the front end portion of the bank portion 24.

  The cowl grill front portion 21 is formed with a vertical front wall portion 26 having an upper end disposed slightly forward of the lower end and the upper end side inclined slightly forward. The upper half of the front wall portion 26 is the upper portion of the cowl grille. It is provided so as to overlap the front side of the 20 reinforcing portions 25. A superposed portion 27 is formed at the upper end portion of the front wall portion 26 so as to extend rearward and overlap with the bank portion 24. The lower end portion of the front wall portion 26 extends forward and overlaps with the upper end portion of the cowl front panel 14. A connecting portion 28 to be connected together is formed. The cowl grill upper portion 20 and the cowl grill front portion 21 are connected to each other by a fixing tool such as a screw (not shown) at the overlapping portion. However, the cowl grill front part 21 and the cowl grill upper part 20 may be manufactured by integral molding.

  If the cowl grill upper part 20 and the cowl grill front part 21 are divided and configured in this way, they can be made of different materials. For example, as a material constituting the cowl grill upper part 20, the performance along the mating with the lower end of the windshield. Therefore, a material softer than the cowl grill front portion 21, such as polypropylene, can be used, and a pedestrian protection performance is ensured as a material constituting the cowl grill front portion 21 as will be described later. Therefore, it can be made of a material that is more brittle than the cowl grill upper portion 20, for example, polyethylene terephthalate containing glass fiber. Further, as a material constituting the cowl grill front portion 21, a material excellent in heat resistance against heat generated from an exhaust manifold or a turbocharger of the engine located in front of the cowl grill 15 can be adopted.

  The rear edge portion of the bonnet 5 is disposed slightly behind the vehicle body from the top of the protruding portion 22 of the cowl grill upper portion 20, and is configured to suppress intrusion of rainwater or the like into the grill portion 23. A sealing member 29 is provided along the overlapping portion 27 on the overlapping portion 27 of the cowl grill front portion 21, and a bonnet reinforcement 30 attached to the back side of the bonnet 5 closes the bonnet 5 in a state where the sealing member 29 is closed. It is configured to be brought into pressure contact with the member 29 to prevent rainwater or the like from entering the engine room 3.

  Next, the sound insulation structure of an automobile will be described. As shown in FIGS. 1 to 5, a cowl grille sound absorbing material 31 extending in the vehicle width direction is provided on the front side of the cowl grille front part 21 over the entire height thereof. A substantially constant interval is formed between the sound absorbing material 31 for the grill and the front wall portion 26 of the cowl grill front portion 21, and the sound absorbing material 31 for the cowl grill is fixed to the cowl grill front portion 21 with screws at appropriate intervals. Yes. The cowl grill sound-absorbing material 31 can be made of felt, but can be made of any material other than felt, such as glass wool, foamed urethane, nonwoven fabric, and foamed polypropylene, as long as it has sound-absorbing properties. The noise absorption material 31 for the cowl grill absorbs noise from the engine and suppresses transmission of noise to the cowl grill 15 side. However, it is also possible to extend the cowl grill sound absorbing material 31 downward and to extend to the front side of the dash panel 17. With this configuration, the transmission of noise into the passenger compartment 16 can be more effectively suppressed. it can. Further, a cowl grille sound absorbing material extending in the vehicle width direction along the cowl grill front part 21 can also be provided on the rear side of the cowl grill front part 21.

  A cowl grill extending portion 32 extending upward from the upper wall portion 7a of the suspension tower 7 is provided integrally with the cowl grill front portion 21 at both ends of the cowl grill front portion 21 in the vehicle width direction. The cowl grill extending portion 32 is provided with a space in the vertical direction with respect to the upper wall portion 7a of the suspension tower 7, and the cowl grill extending portion 32 is fixed to the upper wall portion 7a of the suspension tower 7 with screws or the like at the outer periphery thereof. Has been. Providing such a cowl grille extending portion 32 can block noise entering the engine room 3 from the front suspension 8 through the upper wall portion 7a of the suspension tower 7. Further, since the cowl grille extension part 32 is integrally provided on the cowl grille front part 21, it is possible to suppress the transmission of noise into the passenger compartment 16 without increasing the number of members, and for repair or replacement. When removing the front suspension 8, it is not necessary to remove the entire cowl grille 15 and only the cowl grille front part 21 needs to be removed together with the cowl grille extension part 32, so that the workability when repairing or replacing the front suspension 8 is improved. It can be improved. However, the cowl grill extension 32 may be provided integrally with the cowl grill upper portion 20. Further, in an automobile in which the cowl grill 15 is not divided into the cowl grill front portion 21 and the cowl grill upper portion 20, the cowl grill extending portions 32 are provided at both ends of the cowl grill.

  A sound absorbing material 33 for a tire house is provided along the cowl grill extending portion 32 on the upper side of the cowl grill extending portion 32, and the noise from the suspension tower 7 is absorbed by the sound absorbing material 33 for the tire house. Intrusion of noise into the interior is suppressed, and the quietness in the passenger compartment 16 can be further improved. The sound absorbing material 33 for the tire house can be configured as a member different from the sound absorbing material 31 for the cowl grill, or can be provided integrally at both ends of the sound absorbing material 31 for the cowl grill. Further, as indicated by phantom lines in FIG. 5, it is possible to provide a tire house sound absorbing material 34 between the upper wall portion 7 a of the suspension tower 7 and the cowl grill extension portion 32, and the cowl grill extension portion 32 of the cowl grill extension portion 32. It is also possible to provide the cowl grille sound absorbing materials 33 and 34 on both the upper and lower sides. However, since the sound insulation effect can be obtained to some extent only by the cowl grille extending portion 32, the sound absorbing material 33 for the tire house is not necessarily an essential configuration and can be omitted.

Next, the shock absorbing structure of an automobile will be described.
This shock absorbing structure is intended to alleviate the impact force when a pedestrian gets on the bonnet 5, particularly the impact force on the pedestrian's head. When a load from above is applied to 21, the deformation and destruction of the cowl grill front portion 21 are promoted, and the impact force on the pedestrian is alleviated.

  As shown in FIG. 4, in order to promote deformation and destruction of the cowl grill front portion 21, the cowl grill upper portion 20 and the cowl grill front portion 21 are made of a synthetic resin material, and the front wall portion 26 of the cowl grill front portion 21 is formed. V-shaped notches 35 as weak portions are formed in the middle in the height direction at set intervals in the vehicle width direction or over the entire width in the vehicle width direction. Although the depth of the notch 35 can be arbitrarily set, it is preferably set to 50 to 80% of the plate thickness of the cowl grill front 21 in order to ensure the strength and rigidity of the cowl grill front 21. Specifically, the maximum depth of the cutout portion 35 is set to 1.5 mm, and the plate thickness of the cowl grill front portion 21 is set to 2.5 mm.

  By forming the notch 35 in this manner, as shown by the phantom line in FIG. 4, when the bonnet 5 is deformed downward and a load acts on the cowl grill front part 21 from above, the notch By bending and deforming the cowl grill front part 21 along the part 35, the deformation of the bonnet 5 is promoted, and the impact force on the pedestrian can be reduced.

  In addition, although the formation position of the notch part 35 can be set arbitrarily, for example, the bent part 36 between the front wall part 26 and the overlapping part 27, the bent part 37 between the front wall part 26 and the connecting part 28, or these bent parts Providing in the vicinity of the portions 36 and 37 is preferable because deformation of the cowl grill front portion 21 is further promoted. Moreover, although only one was formed in the middle part in the height direction, it is also possible to form a plurality in the height direction. Furthermore, not only the vehicle width direction but also the notch 35 can be formed in an arbitrary direction such as a vehicle body longitudinal direction or an oblique direction. The point is that any number can be provided at any position as long as it is configured to be easily bent and deformed by an impact load from above so that the impact force on the pedestrian can be reduced. Further, the longitudinal cross-sectional shape of the cowl grill front portion 21 can be formed in a crank shape, a U shape, a Z shape, or the like, but if formed in a Z shape as shown in FIG. This is preferable because it is more likely to be bent by an impact load from above.

  Further, in place of the V-shaped cutout portion 35, a cutout portion 35 having a rectangular groove shape in cross section can be provided. Further, a corrugated portion having one or a plurality of rectangular wave shapes or sine wave shapes whose top portion extends in the vehicle width direction and swings in the longitudinal direction of the vehicle body is formed in the cowl grill front portion 21, and the corrugated portion is formed into a weak portion. It can also be.

  Further, instead of the V-shaped notch 35 or in combination with the V-shaped notch 35, as an engagement structure for connecting the cowl grill front part 21 and the cowl grill upper part 20, the cowl grill front part 21. It is also possible to employ an engagement structure configured such that the engagement is released when a downward impact load is applied. Specifically, like the engagement structure shown in FIG. 6, an engagement hook 38 that protrudes rearward is formed on the front wall portion 26 of the cowl grill front portion 21, and the cowl grille is associated with the engagement hook 38. An engagement hole 39 is formed in the reinforcing portion 25 of the upper portion 20, and the engagement hook 38 is engaged with the lower edge of the engagement hole 39 to fix the cowl grill front portion 21 to the cowl grill upper portion 20. Can do. In this engagement structure, when an impact load is applied to the cowl grill front portion 21 from above, the base portion of the engagement hook 38 is broken, and the cowl grill front portion 21 can freely move downward. The impact load on the pedestrian can be reduced.

  Furthermore, the cowl grill front portion 21 is made of a material that is more brittle than the cowl grill upper portion 20, and the buckling and deformation of the cowl grill front portion 21 due to a load from above is promoted to absorb collision energy more efficiently. You can also Further, as shown by phantom lines in FIG. 3, a reinforcing rib 40 protruding downward is provided on the cowl grill upper portion 20 to set a large difference in strength between the cowl grill front portion 21 and the cowl grill upper portion 20. If the load is easily applied to the weak part, the collision energy can be absorbed with certainty by the weak part. The arrangement, number, length, thickness, height, direction, and the like of the reinforcing ribs 40 can be arbitrarily set.

  In addition, as a structure for reducing the impact load on the pedestrian, as shown in FIGS. 2 and 7, side openings 41 are formed at both ends of the cowl grill 15, and the side openings 41 are formed by the cowl grill 15. Alternatively, the cover member 42 made of a soft material such as a thermoplastic elastomer can be used for closing. When such a structure is provided, the strength and rigidity of the side portion of the cowl grill 15 with respect to a load from above can be set low, the deformation of the bonnet 5 can be promoted, and the impact force on the pedestrian can be reduced.

Perspective view of the main part near the tire house of an automobile Cowl grill perspective view III-III sectional view of FIG. Cross section near the front of the cowl grill V-V cross-sectional view of Fig. 1 FIG. 4 equivalent view showing the engagement structure of another configuration VII-VII sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front side frame 2 Apron reinforcement 3 Engine room 4 Apron panel 5 Bonnet 6 Tire house 7 Suspension tower 7a Upper wall part 8 Front suspension 8a Bolt member 9 Nut member 10 Front pillar 11 Cowl upper panel 12 Cowl lower panel 13 Cowl 14 Cowl front Panel 15 Cowl grill 16 Car compartment 17 Dash panel 19 Front window 20 Cowl grill upper part 21 Cowl grill front part 22 Projection part 23 Grill part 24 Bank part 25 Reinforcement part 26 Front wall part 27 Superposition part 28 Connection part 29 Seal member 30 Bonnet rain Force 31 Sound absorbing material for cowl grill 32 Cowl grill extending portion 33 Sound absorbing material for tire house 34 Sound absorbing material for tire house 35 Notch portion 36 Bending portion 37 Bending portion 38 Engagement Hook 39 Engagement hole 40 Reinforcing rib 41 Side opening 42 Cover member

Claims (6)

In an automobile provided with a cowl grill having an upper cowl grill extending from the upper front edge of the front window to the lower rear edge of the bonnet, and a front cowl grill extending from the front edge of the upper cowl grill.
The cowl grille is provided with a cowl grille extending portion that extends onto the tire house and is detachably fixed to the tire house ,
A sound absorbing material for a cowl grille extending in the vehicle width direction along the front part of the cowl grille is provided,
A sound absorber for a tire house is provided along the cowl grille extending portion,
The cowl grill is divided into an upper part of the cowl grill and a front part of the cowl grill, an overlapping part extending rearward is formed at the upper end part of the front part of the cowl grille, and the front end part of the upper part of the cowl grill is overlapped with the lower side of the overlapping part. with connecting combined, the cowl grille extending portion in mosquito Uruguriru front integrally provided,
A sound insulation structure for automobiles.   The sound insulation structure for an automobile according to claim 1, wherein the tire house sound absorbing material is provided between the cowl grille extending portion and the tire house.   The sound insulation structure for an automobile according to claim 1 or 2, wherein a sound absorbing material for a tire house is integrally provided at both ends of the sound absorbing material for the cowl grill. The weak part which accelerates | stimulates the bending deformation of a cowl grill front part with respect to the load from upper direction was formed in the said cowl grill front part at every set space | interval in a vehicle width direction, or the full width of the vehicle width direction. 4. The sound insulation structure for an automobile according to any one of 3 above. The sound insulation structure for an automobile according to any one of claims 1 to 4, wherein the cowl grill upper part and the cowl grill front part are connected with an engagement structure weak against a load from above. The sound insulation structure for an automobile according to any one of claims 1 to 5, wherein the cowl grill upper part is made of a material softer than the cowl grill front part, and the cowl grill front part is made of a material more brittle than the cowl grill upper part.

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